<template>
  <div v-if='playList.length>0' class="player">
    <transition name='normal'
                appear
                @enter='enter'
                @after-enter='afterEnter'
                @leave='leave'
                @after-leave='afterLeave'
    >
      <div class='normal-player' v-show='fullScreen'>
        <div class='background'>
          <img width='100%' height='100%' :src='currentSong.image'>
        </div>
        <div class='top'>
          <div class='back' @click='back'>
            <i class='icon-back'></i>
          </div>
          <h1 class='title' v-html='currentSong.name'></h1>
          <h2 class='subtitle' v-html='currentSong.singer'></h2>
        </div>
        <div class='middle'
             @touchstart.prevent='middleTouchstart'
             @touchmove.prevent='middleTouchmove'
             @touchend.prevent='middleTouchend'
        >
          <div class='middle-l' ref='middleL'>
            <div class='cd-wrapper' ref='cdWrapper'>
              <div class='cd' :class='cdCls'>
                <img :src='currentSong.image' class='image'>
              </div>
            </div>
            <div class='playing-lyric-wrapper'>
              <div class='playing-lyric'>{{playingLyric}}</div>
            </div>
          </div>
          <scroll class='middle-r' ref='lyricList' :data='currentLyric && currentLyric.lines'>
            <div class='lyric-wrapper'>
              <div v-if='currentLyric'>
                <p ref='lyricLine'
                   class='text'
                   :class='{current:index === currentLineNum}'
                   v-for='(line,index) in currentLyric.lines'
                >{{line.txt}}</p>
              </div>
            </div>
          </scroll>
        </div>
        <div class='bottom'>
          <div class='dot-wrapper'>
            <span class='dot' :class="{active:currentShow === 'cd'}"></span>
            <span class='dot' :class="{active:currentShow !== 'cd'}"></span>
          </div>
          <div class='progress-wrapper'>
            <span class='time time-l'>{{format(currentTime)}}</span>
            <div class='progress-bar-wrapper'>
              <progress-bar :percent='percent' @percentChange='percentChange'></progress-bar>
            </div>
            <span class='time time-r'>{{format(currentSong.duration)}}</span>
          </div>
          <div class='operators'>
            <div class="icon i-left" @click="changeMode">
              <i :class="iconMode"></i>
            </div>
            <div class='icon i-left' :class='disableCls'>
              <i @click='prev' class='icon-prev'></i>
            </div>
            <div class='icon i-center' :class='disableCls'>
              <i @click='togglePlaying' :class='playIcon'></i>
            </div>
            <div class='icon i-right' :class='disableCls'>
              <i @click='next' class='icon-next'></i>
            </div>
            <div class='icon i-right'>
              <i class='icon' :class='getFavoriteIcon(currentSong)' @click='toggleFavorite(currentSong)'></i>
            </div>
          </div>
        </div>
      </div>
    </transition>
    <transition name='mini' appear>
      <div class='mini-player' v-show='!fullScreen' @click='open'>
        <div class='icon'>
          <img :class='cdCls' width='40' height='40' :src='currentSong.image'>
        </div>
        <div class='text'>
          <h2 class='name' v-html='currentSong.name'></h2>
          <p class='desc' v-html='currentSong.singer'></p>
        </div>
        <div class='control'>
          <progress-circle :radius="32" :percent="percent">
            <i @click.stop='togglePlaying' class="icon-mini" :class='miniIcon'></i>
          </progress-circle>
        </div>
        <div class='control' @click.stop='showPlaylist'>
          <i class='icon-playlist'></i>
        </div>
      </div>
    </transition>
    <playlist ref='playlist'></playlist>
    <audio ref='audio'
           :src='currentSong.url'
           @timeupdate='updateTime'
           @play='canplay'
           @error='err'
           @ended='end'
    ></audio>
  </div>
</template>

<script>
  import { mapGetters, mapMutations, mapActions } from 'vuex'

  import animations from 'create-keyframe-animation'
  import { prefixStyle } from 'common/js/dom'
  import { playMode } from 'common/js/config'
  import ProgressBar from 'base/progress-bar/progress-bar'
  import ProgressCircle from 'base/progress-circle/progress-circle'
  import Lyric from 'lyric-parser'
  import Scroll from 'base/scroll/scroll'
  import Playlist from 'components/playlist/playlist'
  import { playerMixin } from 'common/js/mixin'
  //https://www.cnblogs.com/qianduanjingying/p/6812660.html
  //https://blog.csdn.net/yanyiping992/article/details/80133019
  //https://www.javascriptcn.com/read-48483.html

  const transform = prefixStyle('transform')
  const transitionDuration = prefixStyle('transitionDuration')
  export default {
    mixins: [playerMixin],
    data() {
      return {
        readyPlay: false,
        currentTime: 0,
        currentLyric: null,
        currentLineNum: 0,
        currentShow: 'cd',
        playingLyric: ''
      }
    },
    created() {
      this.touch = {}
    },
    methods: {
      showPlaylist() {
        this.$refs.playlist.show()
      },
      back() {
        this.setFullScreen(false)
      },
      open() {
        this.setFullScreen(true)
      },
      enter(el, done) {
        const { x, y, scale } = this._getPosAndScale()
        let animation = {
          0: {
            transform: `translate3d(${x}px,${y}px,0) scale(${scale})`
          },
          60: {
            transform: `translate3d(0,0,0) scale(1.1)`
          },
          100: {
            transform: `translate3d(0,0,0) scale(1.0)`
          }
        }
        animations.registerAnimation({
          name: 'move',
          animation,
          presets: {
            duration: 400,
            easing: 'linear'
          }
        })
        animations.runAnimation(this.$refs.cdWrapper, 'move', done)
      },
      afterEnter() {
        animations.unregisterAnimation('move')
        this.$refs.cdWrapper.style.animation = ''
      },
      leave(el, done) {
        this.$refs.cdWrapper.style.transition = 'all 0.4s'
        const { x, y, scale } = this._getPosAndScale()
        this.$refs.cdWrapper.style[transform] = `translate3d(${x}px,${y}px,0) scale(${scale})`
        this.$refs.cdWrapper.addEventListener('transitionend', done)
      },
      afterLeave(el, done) {
        this.$refs.cdWrapper.style.transition = ''
        this.$refs.cdWrapper.style[transform] = ''
      },
      togglePlaying() {
        if (!this.readyPlay) {
          return
        }
        this.setPlayingState(!this.playing)
        if (this.currentLyric) {
          this.currentLyric.togglePlay()
        }
      },
      prev() {
        if (!this.readyPlay) {
          return
        }
        if (this.playList.length === 1) {
          this.loop()
        } else {
          let index = this.currentIndex - 1
          if (index === -1) {
            index = this.playList.length - 1
          }
          this.setCurrentIndex(index)
          if (!this.playing) {
            this.togglePlaying()
          }
        }
        this.readyPlay = false
      },
      next() {
        if (!this.readyPlay) {
          return
        }
        if (this.playList.length === 1) {
          this.loop()
          return
        } else {
          let index = this.currentIndex + 1
          if (index === this.playList.length) {
            index = 0
          }

          this.setCurrentIndex(index)
          if (!this.playing) {
            this.togglePlaying()
          }
        }
        this.readyPlay = false
      },
      loop() {
        this.$refs.audio.currentTime = 0
        this.$refs.audio.play()
        if (this.currentLyric) {
          this.currentLyric.seek(0)
        }
      },
      canplay() {
        this.readyPlay = true
        console.log(this.currentSong)
        this.savePlayHistory(this.currentSong)
      },
      end() {
        if (this.mode === playMode.loop) {
          this.loop()
        } else {
          this.next()
        }
      },
      err() {
        this.readyPlay = true
      },
      updateTime(e) {
        this.currentTime = e.target.currentTime
      },
      percentChange(p) {
        const currentTime = this.currentSong.duration * p
        this.$refs.audio.currentTime = currentTime
        if (!this.playing) {
          this.togglePlaying()
        }
        if (this.currentLyric) {
          this.currentLyric.seek(currentTime * 1000)
        }
      },
      format(interval) {
        interval = interval | 0
        const m = interval / 60 | 0
        const s = this._pad(interval % 60)
        return `${m}:${s}`
      },
      getLyric() {
        this.currentSong.getLyric().then((lyric) => {
          if (this.currentsong.lyric !== lyric) {
            return
          }
          this.currentLyric = new Lyric(lyric, this.handleLyric)
          if (this.playing) {
            this.currentLyric.play()
          }
        }).catch(() => {
          this.currentLyric = null
          this.playingLyric = ''
          this.currentLineNum = 0
        })
      },
      handleLyric({ lineNum, txt }) {
        this.playingLyric = txt
        this.currentLineNum = lineNum
        if (lineNum > 5) {
          let lineEl = this.$refs.lyricLine[lineNum - 5]
          this.$refs.lyricList.scrollToElement(lineEl, 1000)
        } else {
          this.$refs.lyricList.scrollto(0, 0, 1000)
        }
      },
      middleTouchstart(e) {
        this.touch.initiated = true
        const touch = e.touches[0]
        this.touch.startX = touch.pageX
        this.touch.startY = touch.pageY

      },
      middleTouchmove(e) {
        if (!this.touch.initiated) {
          return
        }
        const touch = e.touches[0]
        const deltaX = touch.pageX - this.touch.startX
        const deltaY = touch.pageY - this.touch.startY
        if (Math.abs(deltaY) > Math.abs(deltaX)) {
          return
        }
        const left = this.currentShow === 'cd' ? 0 : -window.innerWidth
        const offsetWidth = Math.min(0, Math.max(-window.innerWidth, left + deltaX))
        this.touch.percent = Math.abs(offsetWidth / window.innerWidth)
        this.$refs.lyricList.$el.style[transform] = `translate3d(${offsetWidth}px,0,0)`
        this.$refs.lyricList.$el.style[transitionDuration] = '0'
        this.$refs.middleL.style.opacity = 1 - this.touch.percent
        this.$refs.middleL.style[transitionDuration] = '0'
      },
      middleTouchend(e) {
        let offsetWidth
        let opacity
        if (this.currentShow === 'cd') {
          if (this.touch.percent > 0.1) {
            offsetWidth = -window.innerWidth
            opacity = 0
            this.currentShow = 'lyric'
          } else {
            offsetWidth = 0
            opacity = 1
          }
        } else {
          if (this.touch.percent < 0.9) {
            offsetWidth = 0
            this.currentShow = 'cd'
            opacity = 1
          } else {
            offsetWidth = -window.innerWidth
            opacity = 0
          }
        }
        this.$refs.lyricList.$el.style[transform] = `translate3d(${offsetWidth}px,0,0)`
        this.$refs.lyricList.$el.style[transitionDuration] = '0.3s'
        this.$refs.middleL.style.opacity = opacity
        this.$refs.middleL.style[transitionDuration] = '0.3s'

        this.touch.initiated = false
      },
      _pad(num, n = 2) {
        let len = num.toString().length
        while (len < n) {
          num = '0' + num
          len++
        }
        return num
      },
      _getPosAndScale() {
        const targetWidth = 40
        const paddingLeft = 40
        const paddingBottom = 30
        const paddingTop = 80
        const width = window.innerWidth * 0.8
        const scale = targetWidth / width
        const x = -(window.innerWidth / 2 - paddingLeft)
        const y = window.innerHeight - paddingTop - width / 2 - paddingBottom
        return {
          x,
          y,
          scale
        }
      },

      ...mapMutations({
        setFullScreen: 'SET_FULL_SCREEN'
      }),
      ...mapActions([
        'savePlayHistory'
      ])
    },
    computed: {
      iconMode() {
        return this.mode === playMode.sequence ? 'icon-sequence' : this.mode === playMode.loop ? 'icon-loop' : 'icon-random'
      },
      playIcon() {
        return this.playing ? 'icon-pause' : 'icon-play'
      },
      miniIcon() {
        return this.playing ? 'icon-pause-mini' : 'icon-play-mini'
      },
      cdCls() {
        return this.playing ? 'play' : 'play pause'
      },
      disableCls() {
        return this.readyPlay ? '' : 'disable'
      },
      percent() {
        return Math.min(1, this.currentTime / (this.currentSong.duration))
      },
      ...mapGetters([
        'fullScreen',
        'playing',
        'currentIndex'
      ])
    },
    watch: {
      currentSong(newSong, oldSong) {
        if (!newSong.id) {
          return
        }
        if (newSong && oldSong && newSong.id === oldSong.id) {
          return
        }
        if (this.currentLyric) {
          this.currentLyric.stop()
        }
        clearTimeout(this.timer)
        //监听换歌曲
        this.timer = setTimeout(() => {
          this.$refs.audio.play()
          this.getLyric()
        }, 1000)
      },
      playing(newPlay) {
        // 监听播放状态
        this.$nextTick(() => {
          const audio = this.$refs.audio
          newPlay ? audio.play() : audio.pause()
        })
      }
    },
    components: {
      ProgressBar,
      ProgressCircle,
      Scroll,
      Playlist
    }
  }
</script>

<style lang="stylus" scoped>
  @import "~common/stylus/variable"
  @import "~common/stylus/mixin"

  .player
    .normal-player
      position: fixed
      left: 0
      right: 0
      top: 0
      bottom: 0
      z-index: 150
      background: $color-background
      .background
        position: absolute
        left: 0
        top: 0
        width: 100%
        height: 100%
        z-index: -1
        opacity: 0.6
        filter: blur(20px)
      .top
        position: relative
        margin-bottom: 25px
        .back
          position absolute
          top: 0
          left: 6px
          z-index: 50
          .icon-back
            display: block
            padding: 9px
            font-size: $font-size-large-x
            color: $color-theme
            transform: rotate(-90deg)
        .title
          width: 70%
          margin: 0 auto
          line-height: 40px
          text-align: center
          no-wrap()
          font-size: $font-size-large
          color: $color-text
        .subtitle
          line-height: 20px
          text-align: center
          font-size: $font-size-medium
          color: $color-text
      .middle
        position: fixed
        width: 100%
        top: 80px
        bottom: 170px
        white-space: nowrap
        font-size: 0
        .middle-l
          display: inline-block
          vertical-align: top
          position: relative
          width: 100%
          height: 0
          padding-top: 80%
          .cd-wrapper
            position: absolute
            left: 10%
            top: 0
            width: 80%
            height: 100%
            .cd
              width: 100%
              height: 100%
              box-sizing: border-box
              border: 10px solid rgba(255, 255, 255, 0.1)
              border-radius: 50%
              &.play
                animation: rotate 20s linear infinite
              &.pause
                animation-play-state: paused
              .image
                position: absolute
                left: 0
                top: 0
                width: 100%
                height: 100%
                border-radius: 50%

          .playing-lyric-wrapper
            width: 80%
            margin: 30px auto 0 auto
            overflow: hidden
            text-align: center
            .playing-lyric
              height: 20px
              line-height: 20px
              font-size: $font-size-medium
              color: $color-text-l
        .middle-r
          display: inline-block
          vertical-align: top
          width: 100%
          height: 100%
          overflow: hidden
          .lyric-wrapper
            width: 80%
            margin: 0 auto
            overflow: hidden
            text-align: center
            .text
              line-height: 32px
              color: $color-text-l
              font-size: $font-size-medium
              &.current
                color: $color-text
            .pure-music
              padding-top: 50%
              line-height: 32px
              color: $color-text-l
              font-size: $font-size-medium
      .bottom
        position: absolute
        bottom: 50px
        width: 100%
        .dot-wrapper
          text-align: center
          font-size: 0
          .dot
            display: inline-block
            vertical-align: middle
            margin: 0 4px
            width: 8px
            height: 8px
            border-radius: 50%
            background: $color-text-l
            &.active
              width: 20px
              border-radius: 5px
              background: $color-text-ll
        .progress-wrapper
          display: flex
          align-items: center
          width: 80%
          margin: 0px auto
          padding: 10px 0
          .time
            color: $color-text
            font-size: $font-size-small
            flex: 0 0 30px
            line-height: 30px
            width: 30px
            &.time-l
              text-align: left
            &.time-r
              text-align: right
          .progress-bar-wrapper
            flex: 1
        .operators
          display: flex
          align-items: center
          .icon
            flex: 1
            color: $color-theme
            &.disable
              color: $color-theme-d
            i
              font-size: 30px
          .i-left
            text-align: right
          .i-center
            padding: 0 20px
            text-align: center
            i
              font-size: 40px
          .i-right
            text-align: left
          .icon-favorite
            color: $color-sub-theme
      &.normal-enter-active, &.normal-leave-active
        transition: all 0.4s
        .top, .bottom
          transition: all 0.4s cubic-bezier(0.86, 0.18, 0.82, 1.32)
      &.normal-enter, &.normal-leave-to
        opacity: 0
        .top
          transform: translate3d(0, -100px, 0)
        .bottom
          transform: translate3d(0, 100px, 0)
    .mini-player
      display: flex
      align-items: center
      position: fixed
      left: 0
      bottom: 0
      z-index: 180
      width: 100%
      height: 60px
      background: $color-highlight-background
      &.mini-enter-active, &.mini-leave-active
        transition: all 0.4s
      &.mini-enter, &.mini-leave-to
        opacity: 0
      .icon
        flex: 0 0 40px
        width: 40px
        padding: 0 10px 0 20px
        img
          border-radius: 50%
          &.play
            animation: rotate 10s linear infinite
          &.pause
            animation-play-state: paused
      .text
        display: flex
        flex-direction: column
        justify-content: center
        flex: 1
        line-height: 20px
        overflow: hidden
        .name
          margin-bottom: 2px
          no-wrap()
          font-size: $font-size-medium
          color: $color-text
        .desc
          no-wrap()
          font-size: $font-size-small
          color: $color-text-d
      .control
        flex: 0 0 30px
        width: 30px
        padding: 0 10px
        .icon-play-mini, .icon-pause-mini, .icon-playlist
          font-size: 30px
          color: $color-theme-d
        .icon-mini
          font-size: 32px
          position: absolute
          left: 0
          top: 0

  @keyframes rotate
    0%
      transform: rotate(0)
    100%
      transform: rotate(360deg)
</style>
